Hi,
I am not sure if we can integrate such a solution, but there might be a way to achieve this with a custom code.
Add this custom code to the functions.php in your theme/child theme directory (copy from line 3 only!). Before editing, please make sure to have a full site back-up just in case!
This will convert the link targets to a new window in the results, whenever it detects, it is from a different host/domain.